Compilare: user.c: In function 'preproc': user.c:30: warning: array subscript has type 'char' user.c:32: warning: array subscript has type 'char' user.c:32: warning: array subscript has type 'char' user.c: In function 'calc': user.c:45: warning: array subscript has type 'char' user.c: In function 'solve': user.c:63: warning: format '%s' expects type 'char *', but argument 2 has type 'char (*)[1024]' user.c: In function 'main': user.c:88: warning: format '%s' expects type 'char *', but argument 2 has type 'char (*)[1024]'